parthchandra commented on issue #2621:
URL:
https://github.com/apache/datafusion-comet/issues/2621#issuecomment-3438942520
> > "" is not valid input, afaik. Is this even a bug? As in, does Spark
handle this?
>
> Yes, the query runs without error in Spark. I didn't look at the results,
but perhaps it produces a NULL rather than throwing an exception.
Yes, in Spark `functions.date_trunc` the return value is null if the format
string is empty or invalid.
```
* @return A timestamp, or null if `timestamp` was a string that could not
be cast to a timestamp
* or `format` was an invalid value
```
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